Yevgeny Prigozhin trod a dangerous tightrope - his apparent death proves no one is indispensable

A year ago, Wagner chief Prigozhin's mutiny briefly threatened Putin

Yevgeny Prigozhin and his mercenaries seized a military HQ and began marching toward Moscow but called off their mutiny after a few hours. Prigozhin was later killed in an airplane crash, while Wagner has been all but disbanded.